package com.bai.ruiji.fifter;

import com.alibaba.fastjson.JSON;
import com.bai.ruiji.Common.BaseContext;
import com.bai.ruiji.Common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @WebFilter 将此类声明为一个过滤器类
 *    属性：filterName  配置filter的名字
 *         urlPatterns   配置拦截的请求
 * 检查用户是否完成登录
 * @author 27471
 * Time : 2022/10/7 10:10
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckfifter implements Filter {
      //路径匹配器，支持通配符写法
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse)servletResponse;
        //获取本次请求的url
        String requestURI = request.getRequestURI();
       log.info("拦截到请求：{}",requestURI);
        //定义需要处理的路径
        String[] urls=new String[]{
          "/employee/login",
          "employee/logout" ,
          "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login"
        };
        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        if (check){
            //check==true不需要处理，直接放行
           log.info("本次请求不需要处理：{}",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1判断登录状态，如果以登录则放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录id为：{}",request.getSession().getAttribute("employee"));

            Long employee =(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(employee);

            //已登录放行
            filterChain.doFilter(request,response);
            return;
        }

        //4-2判断移动端登录状态，如果以登录则放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录id为：{}",request.getSession().getAttribute("user"));

            Long employeeId =(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(employeeId);

            //已登录放行
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //未登录则返回登录,通过输出流方式向客户端响应页面
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }



    /**
     * 检查本次请求是否需要放行
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls ,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
           if (match){
               return true;
           }
        }
        return false;
    }
}
